31 reviews of AutoZone Auto Parts "The bulb in my headlamp died and this Autozone not only was the least expensive for the replacement bulb, but they installed it at no extra cost. This involved removing the battery to access the headlamp, and probably 12 steps more to remove the old bulb and install the new one and then reinstalling my battery.. The Check Engine Light (CEL) is never good news when it comes on in your car. At a minimum, something as simple as your gas cap may be loose or it could be a failed sensor, wiring, connector. Worse yet, it could be a larger problem like an expensive emissions fault. Ignoring it if the car runs and drives fine may seem reasonable for some time.